I had the same symptoms yesterday but I think I was also in REM because I felt my eye's moving very fast. I was listening to some music what contained 4hz theta waves.

It was a weird feeling and in front of my eyes was somekind of a light.
I think I was asleep conciosly and therefor it should have been a WILD lucid dream but I didn't start to dream. Then I thought that maybe I should take the headphones off and then the computer was to loud and I was unable to concentrate.

Maybe I was in somekind of meditaion state? I'm also new to DV so I don't know...